Within the printer, a computer-controlled laser scans the image onto a photo-conductive drum. This drum contacts blank paper and attracts a dry toner onto its surface. The paper is then drawn across a heated Teflon® coated plate (with a Watlow silicone rubber heater vulcanized to the inside) to cure the toner onto the paper's surface.

The heater must be capable of providing uniform surface temperatures for a variety of paper widths. To accomplish this, our heater features multiple, individually controlled, circuits including several with distributed watt densities. The assembly is perforated with dozens of small holes, which are part of a vacuum system in the final installation. The foil circuits were carefully laid out to clear each hole while minimizing no-heat areas.

The resulting system represents a significant advance in computer hardware technology.